Simosaurus gaillardoti H.v. Meyer, 1842, is recognized as the only species of its genus. An amended diagnosis of the genus is given here. Simosaurus mougeoti H.v. Meyer, 1842, is a lower jaw of Nothosaurus; Simosaurus guilielmi H.v. Meyer, 1847-1855, is a junior synonym of Simosaurus gaillardoti. The skeletal morphology of Simosaurus is redescribed in detail and compared to that of other stem-group (non plesio- and pliosaur) Sauropterygia (including Placodus). Ninety-four skeletal characters... Topics: Sauropterygia -- Phylogeny, Simosaurus gaillardoti -- Morphology
byRieppel, Olivier; Dalla Vecchia, Fabio Marco. joint author Museo Paleontologico, Cittadino di Monfalcone, Monfalcone, Italy
Ichthyosaurian and sauropterygian remains are described from Triassic deposits in the Tre Venezie area of northeastern Italy. The taxa recorded include Mixosaurus, Cymbospondylus, ?Shastasaurus, Placodus, ?Cyamodus, an as yet unnamed cyamodontoid placodont, Nothosaurus sp., and Nothosaurus cf. N. giganteus. The temporal distribution of these fossils ranges from the earliest Anisian to the middle Carnian. Placodus (from the lower upper Anisian Calcare di Recoaro Formation of Vallarsa and... Topics: Sauropterygia -- Italy, Northern, Paleontology -- Triassic
The geographic and stratigraphic occurrence of the Middle Triassic sauropterygian genera Ceresiosaurus, Lariosaurus, and Silvestrosaurus is summarized, and their skeletal morphology is critically reviewed. A cladistic analysis using parsimony supports the synonymy of all three genera, among which Lariosaurus takes priority. The genus Lariosaurus includes five species, balsami, buzzii, calcanii, curionii n. sp., and valceresii, with only partially resolved interrelationships. The sister group of... Topics: Lariosaurus, Silvestrosaurus, Ceresiosaurus, Paleontology -- Triassic, Sauropterygia -- Europe
byRieppel, Olivier; Mazin, Jean-Michel; Tchernov, E. (Eitan)
The Sauropterygia of the Middle Triassic Muschelkalk of Makhtesh Ramon, Negev, are reviewed, and their evolutionary and paleobiogeographic history is reconstructed on the basis of cladistic analysis of their interrelationships. The fauna includes cyamodontoid placodonts (?Psephosaurus) as well as Eosauropterygia such as possible pachypleurosaurs, Simosaurus sp., at least three diagnosable taxa of Nothosaurus (Nothosaurus cf. N. giganteus, N. haasi n. sp., and N. tchernovi), and one lariosaur... Topics: Sauropterygia -- Israel Ramon Crater, Paleontology -- Triassic
The redescription of the holotype and only known specimen of Psilotrachelosaurus toeplitschi Nopcsa, 1928, from the northern Alps of Austria, and its comparison with other pachypleurosauroids show the specimen to represent a distinct genus and species. It is the sister-taxon of the Serpianosaurus-Neusticosaurus clade from the Middle Triassic of Central and Southern Europe (German Lettenkeuper as well as Grenzbitumenzone and Meridekalke of the southern Alps in southern Switzerland and Italy).... Topics: Psilotrachelosaurus toeplitschi, Sauropterygia, Reptiles, Fossil -- Austria, Paleontology --...
byLin, Kebang; Field Museum of Natural History; Rieppel, Olivier
Keichousaurus hui Young, 1958, from the Middle Triassic of Guizhou, China, is a small sauropterygian reptile. It has a short snout and elongated temporal openings, resembling the European pachypleurosaurid Dactylosaurus. Unlike all other stem-group eosauropterygians, the parietal foramen is displaced anteriorly. The neck is long and flexible. The body is rigid and the bones pachyostotic. There are two or three sacral vertebrae. There is distinct sexual dimorphism, as in Alpine... Topics: Keichousaurus hui -- Morphology, Keichousaurus hui -- Development, Sauropyerygia -- Morphology,...
byRieppel, Olivier; Field Museum of Natural History
Three species are currently recognized within the genus Cymatosaurus from the late Scythian and early Anisian of Europe, viz. Cymatosaurus fridericianus v. Fritsch, 1894, Cymatosaurus latifrons Guerich, 1884, and Cymatosaurus multidentatus (F.v. Huene, 1958). All other previously described species of Cymatosaurus are considered either junior synonyms of Cymatosaurus latifrons (C. gracilis Schrammen, 1899; C. silesiacus Schrammen, 1899) or a nomen dubium (C. erythreus E.v. Huene, 1944).... Topics: Cymatosaurus -- Classification, Sauropterygia -- Phylogeny, Reptiles, Fossil -- Europe,...